Iphone 将声音文件上载到服务器

我正在尝试将已录制的m4a格式的声音文件上载到web服务器

下面是一些需要更正的代码：

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Disable Stop/Play button when application launches
    [stopButton setEnabled:NO];
    [playButton setEnabled:NO];

    // Set the audio file
    pathComponents = [NSArray arrayWithObjects:
                               [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject],
                               @"MyAudioMemo.m4a",
                               nil];
    outputFileURL = [NSURL fileURLWithPathComponents:pathComponents];

    // Setup audio session
    AVAudioSession *session = [AVAudioSession sharedInstance];
    [session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];

    // Define the recorder setting
    NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init];

    [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
    [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];
    [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];

    // Initiate and prepare the recorder
    recorder = [[AVAudioRecorder alloc] initWithURL:outputFileURL settings:recordSetting error:nil];
    recorder.delegate = self;
    recorder.meteringEnabled = YES;
    [recorder prepareToRecord];
}

- (IBAction)recordPauseTapped:(id)sender {
    // Stop the audio player before recording
    if (player.playing) {
        [player stop];
    }

    if (!recorder.recording) {
        AVAudioSession *session = [AVAudioSession sharedInstance];
        [session setActive:YES error:nil];

        // Start recording
        [recorder record];
        [recordPauseButton setTitle:@"Pause" forState:UIControlStateNormal];

    } else {

        // Pause recording
        [recorder pause];
        [recordPauseButton setTitle:@"Record" forState:UIControlStateNormal];
    }

    [stopButton setEnabled:YES];
    [playButton setEnabled:NO];
}

- (IBAction)playTapped:(id)sender {
    if (!recorder.recording){
        player = [[AVAudioPlayer alloc] initWithContentsOfURL:recorder.url error:nil];
        [player setDelegate:self];
        [player play];
    }
}

-(IBAction)uploadSound {

    NSURL *theURL = [NSURL URLWithString:outputFileURL];
    NSData *theData = [NSData dataWithContentsOfURL:[NSURL URLWithString:theURL]];

    NSString *urlString = @"http://drewgarcia23.3owl.com/upload.php";

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];

    NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
    [request addValue:contentType forHTTPHeaderField:@"Content-Type"];

    NSMutableData *body = [NSMutableData data];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"userfile\"; filename=\".mov\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[NSData dataWithData:theData]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [request setHTTPBody:body];

    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

    NSLog(@"%@", returnString);
}

除了上传到服务器外，一切正常。我得到这个错误：

*由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[NSURL长度]：未识别的选择器已发送到实例0x7a9a590”

这与IBAction uploadSound中的代码有关：

---

有什么想法吗？

一个问题是，您正在调用URLWithString，向它传递一个NSURL，但它需要一个NSString

例如，考虑线条：

NSURL *theURL = [NSURL URLWithString:outputFileURL];
NSData *theData = [NSData dataWithContentsOfURL:[NSURL URLWithString:theURL]];

这里有两个问题。首先，在第一行中，outputFileURL已经是一个NSURL，因此在创建theURL对象时调用URLWithString没有意义。outputFileURL已经是NSURL，因此不需要进行转换。第二，在第二行中有另一个冗余的URLWithString调用，在第二行中，您使用的URL已经是NSURL，或者如果第一行成功，将是NSURL

这里不需要这两个URLWithString调用中的任何一个。它可能只是：

NSData *theData = [NSData dataWithContentsOfURL:outputFileURL];

---

只有在尝试将NSString转换为NSURL时，才应调用URLWithString。但是，如果您已经有一个NSURL对象，就永远不会调用它。

另外，我不建议在主队列上执行同步网络请求。在处理网络请求时，您的应用程序可能会失去响应，如果时间过长，在极端情况下，看门狗进程甚至可能会杀死您的应用程序。我建议采用某种形式的异步网络上传过程，例如sendAsynchronousRequest。

NSData *theData = [NSData dataWithContentsOfURL:outputFileURL];